To me cam sync is for true dual cam bows and it simply means getting the cams to roll over at the same time so you don't have two different valleys in the draw cycle.

Cam timing refers to single and hybrid cam bows and means that the cams are in the correct position at rest so you get the right amount of rotation during the draw cycle. One cam will normally effect effeciency and let off and the other will normally effect nock travel.

With my Darton using CPS cams I found that the cams could be grossly out of time and the bow still shot fantastic. I actually got a bit more speed out of it at one point by throwing them out of time and using a different length main string. It does effect how the bow feels when you draw it though.

Paul